. >> one where we had to have quick calls of what mht be dangerous because he spent more energy and time thinking about it, you're out of the gene pool. that trait is out we would have adopted shortening fax, emotional filters with how scary they are. and we are still in that animal. we pride ourselves with the intellect and statistics and rationale. the brain is only organ for which we think. most of it happens below the radar. john: i read the research what kills people, fearing terrorism, 300 deaths, but in the 20,000 deaths from falling. crossing streets 5,000, fires 4,000, choking on small objects 3,000, bikes 600 could drowning in a bath tub 300. statistically more likely to kill you know that a terrorist. >> it is wonderful we're having there conversation. make decisions for ourselves, which may feel right but which put us at greater risk. we need to recognize that our risk perception is subjective and formed by feelings as well as just those statistics, and recognize there is a danger in, that this phenomenon of a perception gap is in itself danger we can study, know why it happe